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//
// Lynkeos
// $Id:$
//
// Created by Jean-Etienne LAMIAUD on Fri Nov 14 2008.
// Copyright (c) 2008-2025, Jean-Etienne LAMIAUD.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
#include <LynkeosCore/LynkeosObjectCache.h>
#include "ProcessStackManager.h"
NSString * const K_PROCESS_STACK_REF = @"processStackRef";
@implementation ProcessStackManager
- (id) init
{
if ( (self = [super init]) != nil )
{
_item = nil;
_intermediateRank = NSNotFound;
_currentRank = NSNotFound;
}
return( self );
}
- (void) dealloc
{
if ( _item != nil )
[_item release];
[super dealloc];
}
- (LynkeosImageProcessingParameter*)
getParameterForItem:(LynkeosProcessableImage*)item
andParam:(LynkeosImageProcessingParameter*)inParam
{
LynkeosImageProcessingParameter *outParam = inParam;
NSUInteger idx, previousIdx, stackSize, newIntermediate;
NSAssert( item != nil, @"getParameterForItem called with nil item" );
// Find the parameter in the stack
if ( item != _item )
{
if ( _item != nil )
[_item release];
_item = [item retain];
_stack = (NSMutableArray*)
[item getProcessingParameterWithRef:K_PROCESS_STACK_REF
forProcessing:nil goUp:NO];
}
if ( _stack == nil && inParam != nil )
{
// Create a brand new one
_stack = [NSMutableArray array];
[item setProcessingParameter:(id <LynkeosProcessingParameter>)_stack
withRef:K_PROCESS_STACK_REF forProcessing:nil];
}
if ( inParam == nil && (_stack == nil || [_stack count] == 0) )
// Nothing to do
return( nil );
if ( inParam != nil )
idx = [_stack indexOfObject:inParam];
else
idx = 0;
if ( idx == NSNotFound )
{
// This is the new topmost item in the stack
[inParam setExcluded:NO];
[_stack addObject:inParam];
idx = [_stack count]-1;
if ( idx > 0 )
_intermediateRank = idx-1;
else
_intermediateRank = NSNotFound;
_currentRank = idx;
}
else
{
LynkeosObjectCache *cache = [LynkeosObjectCache imageProcessingCache];
if ( inParam != nil )
[_stack replaceObjectAtIndex:idx withObject:inParam];
stackSize = [_stack count];
// Find the previous result index (by skipping excluded processes)
newIntermediate = NSNotFound;
for( previousIdx = (idx > 0 ? idx-1 : NSNotFound);
previousIdx != NSNotFound;
previousIdx = (previousIdx > 0 ? previousIdx-1 : NSNotFound) )
{
LynkeosImageProcessingParameter*p = [_stack objectAtIndex:previousIdx];
if ( ![p isExcluded] )
{
LynkeosImageBuffer *image = nil;
// Save the new intermediate rank for future processings
if ( newIntermediate == NSNotFound )
newIntermediate = previousIdx;
// Try to find a match in the cache
if ( cache != nil )
{
image = (LynkeosImageBuffer*)[cache getObjectForKey:p];
if ( image != nil )
{
// Set the cached result as the starting image
[_item setResult:[[image copy] autorelease]];
break;
}
}
}
}
if ( _intermediateRank != newIntermediate )
_intermediateRank = newIntermediate;
if ( previousIdx == NSNotFound )
{
// Restart from the begining to get the new intermediate result
if ( ![item isOriginal] )
[item revertToOriginal];
_currentRank = 0;
}
else
// Restart after this process as a cached or intermediate result matches
_currentRank = previousIdx+1;
// Skip excluded processes to start at a real one
for ( ; _currentRank < stackSize; _currentRank++ )
{
outParam = [_stack objectAtIndex:_currentRank];
if ( ![outParam isExcluded] )
break;
}
if ( _currentRank >= stackSize )
{
outParam = nil; // All remaining processes are excluded
_currentRank = NSNotFound;
}
}
return( outParam );
}
- (LynkeosImageProcessingParameter*) nextParameterToProcess:
(LynkeosProcessableImage*)item
{
NSUInteger stackSize;
LynkeosImageProcessingParameter *outParam = nil;
NSAssert( item == _item, @"Change of item before end of stack processing" );
NSAssert( _currentRank != NSNotFound, @"Process unknown in the stack" );
LynkeosObjectCache *cache = [LynkeosObjectCache imageProcessingCache];
if ( cache != nil || _currentRank == _intermediateRank )
{
// Save all temporary results in the cache
LynkeosImageBuffer* res = [_item getResult];
if (res != nil)
{
LynkeosImageBuffer* image = [[res copy] autorelease];
if ( cache != nil )
[cache setObject:image forKey:[_stack objectAtIndex:_currentRank]];
}
}
// Find the next process to execute
_currentRank++;
stackSize = [_stack count];
for (; _currentRank < stackSize; _currentRank++ )
{
outParam = [_stack objectAtIndex:_currentRank];
if ( ![outParam isExcluded] )
break;
}
if ( _currentRank >= stackSize )
// Stack ended or all remaining processes are excluded
_currentRank = NSNotFound;
return( outParam );
}
@end
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